There’s nothing wrong with just letting the kids read and discover things on their own. I’ve learned plenty of things as I’ve had to answer questions from our kids that I never saw in certain Scriptures.
i do not think there is anything wrong with it, but i did not expect that my sons would have learned a lot that way... now that our oldest is 17, he is able to do some studying on his own, but often uses concordances and his daddy and me as guidance when he has questions...